This Standard specifies the signalling protocol for the support
of the Wireless Terminal Location Registration supplementary service
(SS-WTLR) and the Wireless Terminal Information exchange additional
network feature (ANF-WTINFO) at the Q reference point between
Private Integrated services Network eXchanges (PINXs) connected
together within a Private Integrated Services Network (PISN).

SS-WTLR is a supplementary service which enables a WTM user to
register at, or deregister from, the current location within the
PISN. The ability to register at different locations in the PISN
at different times enables the WTM user to maintain the provided
services (including the ability to make and receive calls) at
different access points. Deregistration is used to inform the
PISN that the WTM user is temporarily unable to make use of the
provided services (including the receipt of calls).

ANF-WTINFO is an additional network feature which enables transfer
of restriction information between Home PINX and Visitor PINX.
ANF-WTINFO also enables the Visitor PINX or Home PINX to initiate
a check of the current location information.

Supplementary Service specifications and Additional Network Feature
specifications are produced in three stages and according to the
method specified in ITU-T Rec. I.130. This Standard contains the
stage 3 specification for the Q reference point and satisfies
the requirements identified by the stage 1 and stage 2 specifications
in ECMA-301.

The signalling protocol for SS-WTLR and ANF-WTINFO uses certain
aspects of the generic procedures for the control of supplementary
services specified in ECMA-165.

This Standard also specifies additional signalling protocol requirements
for the support of interactions at the Q reference point between
SS-WTLR and other supplementary services and ANFs.

This Standard is applicable to PINXs which can interconnect to
form a PISN.

The protocol defined in this Standard forms part of the PSS1
protocol (informally known as QSIG).